Re: [PATCH v7 5/8] dt-bindings: display: add i.MX6 MIPI DSI host controller doc

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Adrian,

Thank you for the patch.

On Tue, Apr 21, 2020 at 07:16:07PM +0300, Adrian Ratiu wrote:
> This provides an example DT binding for the MIPI DSI host controller
> present on the i.MX6 SoC based on Synopsis DesignWare v1.01 IP.
> 
> Cc: Rob Herring <robh@kernel.org>
> Cc: Neil Armstrong <narmstrong@baylibre.com>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Cc: devicetree@vger.kernel.org
> Tested-by: Adrian Pop <pop.adrian61@gmail.com>
> Tested-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>
> Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.com>
> Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
> ---
> Changes since v6:
>   - Added ref to the newly created snps,dw-mipi-dsi.yaml (Laurent)
>   - Moved *-cells properties outside patternProperties (Laurent)
>   - Removed the panel port documentation (Laurent)
>   - Wrapped lines at 80 chars, typo fixes, sort includes (Laurent)
> 
> Changes since v5:
>   - Fixed missing reg warning (Fabio)
>   - Updated dt-schema and fixed warnings (Rob)
> 
> Changes since v4:
>   - Fixed yaml binding to pass `make dt_binding_check dtbs_check`
>   and addressed received binding feedback (Rob)
> 
> Changes since v3:
>   - Added commit message (Neil)
>   - Converted to yaml format (Neil)
>   - Minor dt node + driver fixes (Rob)
>   - Added small panel example to the host controller binding
> 
> Changes since v2:
>   - Fixed commit tags (Emil)
> ---
>  .../display/imx/fsl,mipi-dsi-imx6.yaml        | 135 ++++++++++++++++++
>  1 file changed, 135 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml b/Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml
> new file mode 100644
> index 0000000000000..b73e3ae33a852
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml
> @@ -0,0 +1,135 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/imx/fsl,mipi-dsi-imx6.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale i.MX6 DW MIPI DSI Host Controller
> +
> +maintainers:
> +  - Adrian Ratiu <adrian.ratiu@collabora.com>
> +
> +description: |
> +  The i.MX6 DSI host controller is a Synopsys DesignWare MIPI DSI v1.01
> +  IP block with a companion PHY IP.
> +
> +  These DT bindings follow the Synopsys DW MIPI DSI bindings defined in
> +  Documentation/devicetree/bindings/display/bridge/dw_mipi_dsi.txt with
> +  the following device-specific properties.
> +
> +allOf:
> +  - $ref: ../bridge/snps,dw-mipi-dsi.yaml#
> +
> +properties:
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +  compatible:
> +    items:
> +      - const: fsl,imx6q-mipi-dsi
> +      - const: snps,dw-mipi-dsi
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Module Clock
> +      - description: DSI bus clock
> +
> +  clock-names:
> +    items:
> +      - const: ref
> +      - const: pclk
> +
> +  fsl,gpr:
> +    description:
> +      Phandle to the iomuxc-gpr region containing the multiplexer ctrl register.
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +
> +  ports:
> +    type: object
> +    description: |
> +      A node containing DSI input & output port nodes with endpoint
> +      definitions as documented in
> +      Documentation/devicetree/bindings/media/video-interfaces.txt
> +      Documentation/devicetree/bindings/graph.txt
> +    properties:
> +      port@0:
> +        type: object
> +        description:
> +          DSI input port node, connected to the ltdc rgb output port.
> +
> +      port@1:
> +        type: object
> +        description:
> +          RGB output port node, connected to a panel or a bridge input port.

Isn't it the other way around, doesn't the bridge take RGB input and
output DSI ? And to be precise, it's not about RGB, but about the input
being parallel interface (DSI will also carry RGB).

I would add

    required:
      - port@0
      - port@1


> +
> +additionalProperties: false
> +
> +patternProperties:
> +  "^panel@[0-3]$":
> +    type: object
> +
> +required:
> +  - "#address-cells"
> +  - "#size-cells"
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - ports
> +
> +examples:
> +  - |+
> +    #include <dt-bindings/clock/imx6qdl-clock.h>
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    dsi: dsi@21e0000 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        compatible = "fsl,imx6q-mipi-dsi", "snps,dw-mipi-dsi";
> +        reg = <0x021e0000 0x4000>;
> +        interrupts = <0 102 IRQ_TYPE_LEVEL_HIGH>;
> +        fsl,gpr = <&gpr>;
> +        clocks = <&clks IMX6QDL_CLK_MIPI_CORE_CFG>,
> +                 <&clks IMX6QDL_CLK_MIPI_IPG>;
> +        clock-names = "ref", "pclk";
> +
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;

port@0 is missing.

> +            port@1 {
> +                reg = <1>;
> +                dsi_out: endpoint {
> +                    remote-endpoint = <&panel_in>;
> +                };
> +            };
> +        };
> +
> +        panel@0 {
> +            compatible = "sharp,ls032b3sx01";
> +            reg = <0>;
> +            reset-gpios = <&gpio6 8 GPIO_ACTIVE_LOW>;
> +            ports {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                port@0 {
> +                    reg = <0>;
> +                    panel_in: endpoint {
> +                        remote-endpoint = <&dsi_out>;
> +                    };
> +                };
> +            };
> +        };
> +    };
> +
> +...

-- 
Regards,

Laurent Pinchart